Era
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1918-1952
22
1959-1990
22
2009-2017
22
1865-1918
21
1815-1861
20
1951-
20
1981-
20
Since 1997
20
1984-
19
1992-
19
1993-
19
1929
18
1959-
18
1964-1985
17
1977-
17
1917-1945
16
1952-
16
1971-1981
16
1974-
16
1983-
16
To 1775
16
1917-1936
15
1918-1933
15
1968-
15
2001-2009
15
Civil War, 1861-1865
15
1775-1865
14
1837-1901
14
1865-1900
14
1946-
14
1960-1980
14
1976-
14
1981-1989
14
Since 1947
14
Since 1976
14
Since 1990
14
1961-
13
1995-
13
Since 1949
13
Since 1979
13
Since 1994
13
1945-1982
12
1962-
12
1970-1991
12
1972-
12
2007-
12
1865-
11
1953-1985
11
1960-1988
11
1966-1998
11
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